Interaction between simultaneous contraction and relaxation in different limbs

Koki Kato, Tetsuro Muraoka, Takatoshi Higuchi, Nobuaki Mizuguchi, Kazuyuki Kanosue

研究成果: Article

14 引用 (Scopus)

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We investigated the interaction between relaxation and contraction for remote, ipsilateral muscles of the hand and foot (wrist extensor/ankle dorsiflexor). Subjects sat in an armchair and were able to freely move their right hand and foot. They performed eight tasks: (1) wrist extension from a flexed (relaxed) position, (2) ankle dorsiflexion from a plantarflexed (relaxed) position, (3) wrist relaxation from an extended position, (4) ankle relaxation from a moderately dorsiflexed position. The remaining tasks involved (5) simultaneous performance of tasks 1 and 2, (6) 3 and 4, (7) 1 and 4, and (8) 2 and 3. Subjects performed each task as fast as possible after hearing a start signal. They were instructed not to activate antagonistic muscles in the tasks involving relaxation. When contraction of the wrist flexor/ankle dorsiflexor was concurrent with relaxation of the ipsilateral limb (ankle dorsiflexor/wrist extensor), the reaction time of contraction as observed in electromyography (EMG) activities in the wrist extensor/ankle dorsiflexor became longer and the EMG activities became smaller. Our findings suggest that muscle relaxation in one limb interferes with smooth movement of muscle contraction in the ipsilateral limb.

元の言語English
ページ(範囲)181-189
ページ数9
ジャーナルExperimental Brain Research
232
発行部数1
DOI
出版物ステータスPublished - 2014 1

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ASJC Scopus subject areas

  • Neuroscience(all)

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